In 1993, at the Copenhagen European Council, the Union took a decisive step towards the fifth enlargement, agreeing that “the associated countries in Central and Eastern Europe that so desire shall become members of the European Union.” Thus, enlargement was no longer a question of ‘if’, but ‘when’.
Concerning the timing, the European Council states: “Accession will take place as soon as an associated country is able to assume the obligations of membership by satisfying the economic and political conditions required.” At the same time, it defined the membership criteria, which are often referred to as the ‘Copenhagen criteria’.
Membership criteria require that the candidate country must have achieved
Membership criteria also require that the candidate country must have created the conditions for its integration through the adjustment of its administrative structures, as underlined by the Madrid European Council in December 1995. While it is important that European Community legislation is transposed into national legislation, it is even more important that the legislation is implemented effectively through appropriate administrative and judicial structures. This is a prerequisite of the mutual trust required by EU membership.